Chromate Free Corrosion Resistant Coatings using Water-Dispersible Tannisulfonic Acid-Doped Conducting Polymers and Nanocomposites (TSE03-B)

使用水分散性丹尼磺酸掺杂导电聚合物和纳米复合材料的无铬酸盐耐腐蚀涂层 (TSE03-B)

• 批准号: 0327826
• 负责人: Tito Viswanathan
• 金额: $ 30万
• 依托单位: University of Arkansas Little Rock
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0327826&HistoricalAwards=false
• 关键词: Chromate; Free; Corrosion; Resistant; Coatings

Continuing restrictions on volatile organic compounds (VOCs) and heavy metals such as chromium in conversion coatings have made it necessary to search for novel alternatives. Although inherently conducting polymers (ICPs) have long been known to inhibit the corrosion process of metals, their use in industry (with the exception of Ormecon in Europe) has been limited by their insolubility. The ICPs proposed in this project will utilize tanninsulfonic acid, a renewable resource material, as a template/dopant to yield water-dispersible systems. Due to the already known ability of tannin to prevent corrosion, tanninsulfonic acid-doped ICPs should provide environmentally friendly corrosion inhibitors. Since tannins are known to complex metal ions efficiently due to the presence of the o-catechol groups and the fact that certain metal oxo nanocomposites themselves have been shown to inhibit corrosion, metal oxo nanocomposites chelated to tanninsulfonic acid will be synthesized. These tannin based nanocomposites will be used as templates/dopants for the synthesis of novel water-dispersible ICPs. As a result of the synergistic effects, these corrosion inhibitors may prove to be highly effective. The synthesized ICPs will be characterized using various spectroscopic and electrochemical methods. Those that show sufficient conductivity, electroactivity, and dispersibility will be blended with a variety of water-based commercial resins and applied on a variety of substrates including alloys of iron and aluminum that are commonly used in industry. Substrate preparation and coating application will be performed according to ASTM standards. Corrosion testing will be performed using electrochemical corrosion techniques such as electrochemical impedance spectroscopy, cyclic polarization and Tafel plots. The results from these tests will be directly compared with conventional barrier and conversion coatings including chromates. Broader ImpactDue to the high volume of ICPs that could be used in the coating industry, the future of conducting polymers may well lie in their success in corrosion inhibition. In addition, the data generated during this research will be helpful in elucidating the mechanism of corrosion prevention which still remains somewhat elusive. The concept of using a renewable resource as a substitute for a toxic heavy metal as well as in reducing VOCs without sacrificing desirable properties in corrosion resistant coatings is both environmentally and economically appealing and fits well with the scope of this NSF/EPA project. The involvement of students in this project provides them an opportunity to be involved in cutting edge research of importance to the environment that includes elimination of chromates and VOCs at the source, while training them to be polymer chemists. ICPs have already shown promise in the biomedical field especially in the area of nerve regeneration and artificial muscles. A concerted effort will be made to include members of the research community at the nearby medical school in workshops and seminars so that future collaborative projects with our group may be possible.

对转化涂料中挥发性有机化合物（VOC）和重金属（如铬）的持续限制使得有必要寻找新的替代品。虽然固有导电聚合物（ICP）长期以来一直被认为可以抑制金属的腐蚀过程，但它们在工业中的应用（欧洲的Ormecon除外）受到其不溶性的限制。本项目中提出的ICP将利用可再生资源材料鞣酸作为模板/掺杂剂来产生水分散体系。由于已知单宁具有防止腐蚀的能力，因此单宁磺酸掺杂的ICP应该提供环境友好的腐蚀抑制剂。由于已知单宁由于邻苯二酚基团的存在而有效地络合金属离子，并且某些金属氧代纳米复合材料本身已被证明抑制腐蚀，因此将合成螯合到单宁磺酸的金属氧代纳米复合材料。这些单宁基纳米复合材料将被用作模板/掺杂剂的新型水分散性ICP的合成。作为协同效应的结果，这些腐蚀抑制剂可被证明是高度有效的。合成的ICP将使用各种光谱和电化学方法进行表征。那些表现出足够的导电性，电活性和导电性的材料将与各种水基商业树脂混合，并应用于各种基材上，包括工业中常用的铁和铝合金。基材制备和涂层应用将根据ASTM标准进行。将使用电化学腐蚀技术（如电化学阻抗谱、循环极化和塔菲尔图）进行腐蚀测试。这些测试的结果将直接与包括铬酸盐在内的传统阻隔和转化涂层进行比较。更广泛的影响由于大量的ICP可用于涂料工业，导电聚合物的未来很可能取决于它们在腐蚀抑制方面的成功。此外，在这项研究中产生的数据将有助于阐明仍然有些难以捉摸的防腐蚀机制。使用可再生资源作为有毒重金属的替代品以及减少VOC而不牺牲耐腐蚀涂层的理想性能的概念在环境和经济上都具有吸引力，并且非常适合NSF/EPA项目的范围。学生参与这个项目为他们提供了一个机会，参与对环境具有重要意义的前沿研究，包括从源头上消除铬酸盐和VOC，同时培训他们成为聚合物化学家。ICP已经在生物医学领域显示出前景，特别是在神经再生和人造肌肉领域。我们将共同努力，让附近医学院的研究界成员参加讲习班和研讨会，以便将来与我们的小组开展合作项目。